TelephonesVoIP Desk Phone
Poly CCX 350 Telephone Manual
Setup, everyday use, maintenance and troubleshooting for the VoIP desk phone, with verified specifications.
- TypeVoIP Desk Phone
- LineVoIP (IP network)
- Standby power1.5 W
- Est. yearly cost$2.23
About the Poly CCX 350
The Poly CCX 350 is a VoIP desk phone certified under the ENERGY STAR program for telephony.
It connects to your network as a Voice over IP (VoIP) endpoint rather than to an analog phone line. It is powered by an external AC adapter. The certification record also lists a USB port.
Measured standby power is 1.5 W — about 13.1 kWh or $2.23 a year if it stays plugged in around the clock, as phones normally do. That is lower than 76% of the 85 VoIP Desk Phone models in our database.
Specifications
| Brand | Poly |
|---|---|
| Model number | CCX 350 |
| Phone type | VoIP Desk Phone |
| Line technology | VoIP |
| Configuration | Corded |
| External power adapter | Included |
| USB port | Yes |
| Standby (idle) power | 1.50 W |
Safety information
- Use only the power adapter supplied with the phone or exact replacements from the manufacturer.
- Do not use the phone near water — for example near a bathtub, sink or swimming pool — and never handle it with wet hands.
- Avoid using any phone connected to outdoor wiring during a thunderstorm.
- Do not use the phone to report a gas leak while you are near the leak. Leave the area first.
- A VoIP phone works only when its network, power source (PoE switch or adapter) and phone service are up. Keep an alternative way to call 911 during outages.
Setup
- Connect to the network
Connect the phone's LAN port to a network switch port with an Ethernet cable. Plug in the AC adapter.
- Provision the phone
Most business VoIP phones are configured automatically from the phone system or by your administrator. For manual setup, enter the SIP account, server and credentials from your service provider in the phone's web interface.
Using your phone
Calls and audio
- Adjust the earpiece or speaker volume during a call with the volume keys; the setting is usually remembered for the next call.
- Call quality on VoIP depends on the network. If voices break up, ask your administrator to prioritize voice traffic (QoS) or use a wired connection.
Wireless and accessory connections
The USB port can be used for supported headsets or accessories; check the manual for compatible devices.
Power use
Phones stay powered all the time, so standby power is what matters. This model draws 1.5 W when idle.
Care and maintenance
| When | What to do |
|---|---|
| Weekly | Wipe the handset, keypad and display with a soft cloth lightly dampened with water or a mild disinfectant wipe; do not spray liquids directly on the phone or use solvents. |
| Every 6 months | Check cords and plugs for damage, and confirm the phone is running the firmware version your administrator or provider recommends. |
Troubleshooting
Try these steps before calling for service. For model-specific error messages, consult the manufacturer's manual or your phone system administrator.
| Problem | Possible cause | What to try |
|---|---|---|
| Phone does not power on | Adapter not connected; outlet off. | Check the adapter connections and outlet. |
| "No service" or registration failed | Network or VLAN settings; provisioning error; account not active. | Restart the phone, confirm it obtains an IP address, and ask your administrator or provider to verify the account and provisioning. |
| Choppy audio, echo or one-way audio | Network congestion; firewall/NAT settings; Wi-Fi interference. | Use a wired connection, enable QoS for voice, and have the administrator check firewall SIP and RTP settings. |
| Display or keys unresponsive | Temporary software fault. | Restart the phone by disconnecting power (or removing the handset battery) for 30 seconds. |
Energy use and running costs
The Poly CCX 350 draws 1.5 W in standby — the idle state it spends nearly all of its time in, connected to the network but not on a call. Plugged in 24 hours a day, 365 days a year, that is about 13.1 kWh per year, or $2.23 at $0.17 per kWh.
Talk time adds very little energy compared with standby, because calls are short relative to the hours the phone sits idle.
Frequently asked questions
What kind of phone is the Poly CCX 350?
It is a VoIP desk phone, listed in ENERGY STAR's corded configuration.
How much electricity does the Poly CCX 350 use?
It draws 1.5 W in standby, about 13.1 kWh per year — roughly $2.23 at $0.17/kWh if left on continuously.
Will the Poly CCX 350 work during a power outage?
Only if the network equipment is on backup power and your phone service is up. Keep another way to call 911.
Is the Poly CCX 350 ENERGY STAR certified?
Yes. It is on the ENERGY STAR certified telephony list, with a certification date of April 2023.
Sources and disclaimer
Specifications on this page come from the ENERGY STAR certified telephones dataset published by the U.S. Environmental Protection Agency (record certified April 20, 2023), retrieved October 7, 2026.
The setup, operating, maintenance and troubleshooting guidance is written by ManualHarbor's editors for this specific product type and configuration. It is an independent guide — not a reproduction of the manufacturer's manual — and ManualHarbor is not affiliated with Poly. Always follow the safety instructions, installation requirements and warranty terms supplied with your unit, and contact Poly or an authorized service provider for warranty repairs and replacement parts.
Running-cost figures use assumed U.S. average utility prices and are estimates for comparison only. See our editorial methodology for details.
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